Ice Ih
normal, hexagonal ice, H2OBeware! The hydrogen atoms in ice Ih are statistically disordered over two sites.
This may give the impression that the structure contains H4O molecules, but this isn't the case. I have represented the disorder with translucent hydrogen atoms.
The low-temperature, ordered version of ice Ih is ice XI.
J. Chem. Phys. (1990) 93, 1412
Professor Martin Chaplin:
Water Structure and Science
Wikipedia:
Ice
Ice Ih
Ice crystals
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